Spark-plug



A. A. WELLS.

` SPARK PLUG. AfPLlCATION FILED SEPT. 26, 1919.

.Patented Sept. 28, 1920.

6 /WENroH Albert A. m21:

ALBERT A. WELLS, os DET-nor?,

swing-PLUG.

Application led Septemberl 26, i919` Serial loA 326,4.-95,

To @ZZ whom 'if moy concern Be il lnownlllizit ALBERT A. lVELLs, e citizen of the United lates, rand aL resident of letroit, in le ce lby of Wzyne und 5 Fit-ale of lv'lieliigun, lm e invented new and useful' improvements in Sple-Plugs, ol ,vnoli the following is e2 full, clear,l and eignet description.

The present invention relates to un iin- 10 pwivenient in sparking devices which are used' for ignitingtlie explosive charge in elle working evlin'elers; of internal combustion engines. is has reference more partie# ulnljf/ to .vliel, are commonly termed spark l5 plugs 'which are used in connection with the jump spark ignition systems.

Primarily the objec ol' the invention is to lrovicle spmkplug of tile tlv/'pe speeilied in which the working parts .may be 20 iemovecl from the engine cylinder independent of the' ou'ier shell for lie purpose of cleaningv the seme Well us to enable. new parts obe insered in lieu of elle removed parts should il, be' necessar; o replace the Z5 parte. l

.5i furllier obliect is to provide ineens for accomplishing the Erst named object in :i simple. and convenient manner, preferably7 to enable alle pars lo be removell Without B0 "elle use of tools.

Further objecs and advantages will np.

pear upon reference to the accompanying drawing Wl'zerein is illusbraed the preferred embodiment of the invention.

ln sait?. dmwing Y Figure l is s top plan viewer u, spurl; plug einbolying the unclzinienal principles of the invention;

l* 1g. 2 isA n, View inI elevation;

g is s sectional view on the line 3-:,

. l is cross ,section on the line lf-47 vo pelis, eomprisii lie outer metallic Y ffll'l having' a redueefl tnremlerl end 2 io be reeeivml wihin rlie usual spark plug opening in the engine cylinder. The other 55 part. Consists primarily ein' :l porcelain or @lller non-eoncllleting bleek '3, smell, for in- Specficatior. of Letters l'aeiit.

'li preferably eonsislgs nf ,an annular flange? :ldap s between the up sence, as a fibrous bleek, having gaf-ell efllension l eclnpell'to be within a central opening in Vee The partr consiss oi in insnl ing for vthe eenvljgll elee' saine may be insulnted l suspended in sn grounded eleefr lle nml pi. gzip lierebetv een. The grow confined en lille shell l @ring for l'ie central eleetrol of the s shoulder on ne bloei; il l in producing lle elo rete gaskets or Wasi s and top and lmom, r' flange l to maille n t1 o' the lilo-el( 3 :@ssprotrudes lie e. siiituble'ggni Y insure n LJ' l2 which plefge n cir 5 :ind the tneliecl lle tween lli-e be von Covering "for me ce insererl ty fle sliell l.

kfrom as zi sl: lit, f. riilefl pos el ring lli :i end 2 of shoulder preiy eier of the #nil oferlle and fillellie The (mp0. ea'nls of' nate above lle p vi le1l Willi liar 19 providing :i can] lever 20.

mmswl l/lunnion Smiling ""fQOis disposed in locking engagement, pres i annular'. contact plate/12 and insure a proper completion of the circuit between the lead wire 14 and the central electrode.

. ln removing the parts, the cam lever Q0 is manipulated to relieve the pressure on `the block 21 whereupon the covering for the central electrode may be removed. The grounded electrode may then be removed next, and any ci the parts thus removed may be readily replaced by'new parts, should the occasion require it. Ot' course, the contact plate. 13 may be withdrawn through the radial slot in the side ot the block 3.

This should be disconnected before an attempt is made to remove the other parts. The straps 15 are preferably made of some flexible metal in order that they may be sprung apart to remove the cam lever, as otherwise the cam lever would interfere with the removal ot the covering tor the Central electrode.

lVhile l realize attempts have been made to accomplish substantially the same result as proposed by my invention, these previous examples are open to many objections in that they fail to appreciate the advantage ot' utilizing the clamping means as a medium tor mamtaming the contact between the central electrode and the lead wire closed under tension. Then again the previously known constructions are prohibited from either a practical or commercial viewpoint. ln my constuction l have utilized the clamping device as a combined assembling means forthe plug parts and a retaining means for the lead wire to the plug.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. A spark plug, comprising an outer shell adapted 'to be attached to the cylinder ot an internal combustion engine, an insulator carrying the central electrode ot the plug adapted to enter the outer shell with the central electrode in sparking relation with a grounded electrode, clamping means including a cam for urging the outer shell and the insulator toward one another and for maintaining said shell and insulator together, said clamping means also `providing means torholding the lead wire to the plug.

2. A spark plug, comprising an outer shell adapted to be attached to the cylinder of an internal combustion engine, an insula# tor carrying the central electrode of the plug adapted to enter the outer shell with the central electrode in sparking relation with a grounded electrode, and clamping means including a cam for urginp the outer shellV and the insulator toward one another and for maintaining said shell and insulator together, said. clamping means also providing means for holding the lead wire to said centi'al electrode and retaining the same in contact therewith under tension,

3. A spark plug, comprising an outer shell, an insulator received by the outer shell, a grounded electrode contined between the insulator and the outer shell, a central electrode carried by the insulator in sparking relation with thel grounded electrode, saidV electrode carried by the insulator vin sparking relation with the grounded electrode, said insulator embodying in its construction a recessed block adapted to receive means tor terminally connecting the central electrode with a lead wire, a pressure block in said recess overlying the said connecting means, and means for producing a pressure on-the pressure block tor clamping the outer shell and the insulator together and maintaining the Contact of the central electrode with the lead wireclosed under tension, `comprising a clamping device having an annular ring engaging the outer shell, straps disposed vertical ot' and on opposite sides ot the plug, and a ram lever having a bearing in the end of the straps and having a wiping contact wit-l1 said pressure block.

ALBERT A.. WELLS. 

